Delivery apparatus for web segments to be stacked



March 3, 1970 H. J. SPENCER ETAL 3,498,600

DELIVERY APPARATUS FOR WEB SEGMENTS TO BE STACKED Filed Dec. 20, 1967 6Sheets-Sheet 1 FIGI '05 D INVENTORS. HARVEY J. SPENCER ERNST DANIELNYSTRAND ATT'YS March 3, 1970 I H J,SPENCIER ETAL 3,498,600

DELIVERY APPARATUS FOR WEB SEGMENTS TO BE STACKED Filed Dec. 20, 1967 6Sheets-Sheet 2 v INVENTORS.

HARVEY J. SPENCER y ERNST DANIEL NYSTRAND engage al/a of ATT'YS March 3,1970 H. J. SPENCER ETA!- 3,498,600

DELIVERY APPARATUS FOR WEB SEGMENTS TO BE STACKED Filed Dec. 20, 1967 sSheets-Sheet 3 HARVEY J. SPENCER ERNST DANIEL NYSTRAND ATT'YS March 3,1970 H, J SPENCER ETAL 3,498,600

DELIVERY APPARATUS FOR WEB SEGMEN'IS TO BE STACKED Filed Dec. 20, 1967 6Sheets-Sheet 4 INVENTORS: HARVEY J. SPENCER ERNST DANIEL NYSTRAND ATT'YSMarch 3, 1970 H. J. SPENCER ET AL 3,498,600

DELIVERY APPARATUS FOR WEB SEGMENTS TO BE STACKED Filed Dec. 20, 1967 sSheets-Sheet s INVENTORS. HARVEY J. SPENCER ERNST DANIEL NYSTRAND ATT'YSMarch 3, 1970 Filed Dec. 20, 1967 CAM PROFILE H. J. SPE-NCER ET AL3,498,600

DELIVERY APPARATUS FOR WEB SEGMENTS TO BE STACKED 6 Sheets-Sheet 6 FIG.I3

TRANSLATION CAM D 56 coum' CAM o 2 IN AND our 57 30 6O 90 I20 I50 I802|O 240 270 300 330 360 C A M R OTA T l O N INVEN'IORS'. HARVEY J.SPENCER ERNST DANIEL NYSTRAND BY: zigig g United States Patent 3,498,600DELIVERY APPARATUS FOR WEB SEGMENTS TO BE STACKED Harvey J. Spencer andErnest Daniel Nystrand, Green Bay, Wis., assignors to Paper ConvertingMachine Company, Inc., Green Bay, Wis., a corporation of Wisconsin FiledDec. 20, 1967, Ser. No. 692,060 Int. Cl. B65h 31/30, 31/34 US. Cl. 271696 Claims ABSTRACT OF THE DISCLOSURE Apparatus for delivering stacks ofweb segments such as towels, tissues, paper hankerchiefs and the likewherein orbiting fingers provided in pairs beside a delivery pad operateto stabilize a stack of previously delivered web segments so as topresent a receiving surface capable of high speed (greater than '500feet per minute) operation.

SUMMARY OF INVENTION This invention constitutes an improvement over thatdisclosed in Nystrand Patent No. 3,254,889. In that patent, orbitingfingers were used in conjunction with reciprocating fingers to receiveindividual web segments such as towels to stack the same and deliver thestacks for packaging. The orbiting fingers performed a countingfunction, i.e., separating the aligned webs into discrete stacks ofpre-determined number. Prior to the machine of the aforementionedpatent, this counting in the paper converting industry was done byhand-divider strips being inserted every so often in the flow of webmaterial. The machine of the above mentioned patent was a definiteimprovement over the prior practice but has been found inadequate toseparate webs into stacks at the high speeds required by the papernapkin and paper hankie producers.

A concurrent problem that existed in attempting to utilize the machineof the aforementioned patent in highspeed operations was that ofdeveloping uneven edges on the stacks. At least the initial layers ofthe stack tended to move laterally so that a nice, square (orrectangular) stack was unobtainable.

These drawbacks are avoided by the use of the machine of the instantinvention and the provision of such a machine constitutes an importantobjective of this invention.

The invention is described in conjunction with the accompanying drawingin which FIG. 1 is a side elevational view of the inventive machine;

FIG. 2 is an enlargement of the encircled portion of FIG. 1;

FIG. 3 is a fragmentary perspective view of the inventive machine takenessentially from the left side of FIG. 1;

FIG. 4 is an elevational view of the machine viewed from just inside ofone of the side frames so as to disclose the essential working parts;

FIG. 5 is a sectional view such as would be seen along the sight line5-5 as applied to FIG. 4;

FIG. 6 is a fragmentary perspective view of the stacking portion of themachine and corresponds to a view taken along the lines 66 of FIG. 4;

FIGS. 7-10 are schematic views showing the operation of the variousfinger assemblies on stacks of web segments;

FIGS. 11 and 12 are sectional views taken along the sight lines 99 and10 applied to FIG. 4 in the vicinity of the stack remover; and

"Ice

FIG. 13 is a graph plotting cam contour as a function of camrotation-cams being employed to control the movement of theaforementioned finger assembles in developing stacks.

In the illustration given and with particular reference to FIG. 1, thenumeral 20 designates the frame of the machine which, in accordance withconventional practice, includes two relatively heavy side members as at20a and 20b in FIG. 1. Usually provided as part of the machine frame isthe apparatus for delivering the webbed segments into the stackingstation or area. The forming anddelivery mechanism need not be thatillustrated here and may take a variety of forms. In certain aspects itis described in greater detail in the aforementioned Patent No.3,254,889. The superstructure designated D in FIG. 1 shows thisgenerally.

WEB DELIVERY MECHANISM The web in FIG. 4 is designated by the symbol Wand is seen to pass between a cutoff roll 21 equipped with knives 22 andoperating against an anvil roll 23. Both of these rolls areadvantageously rotatably supported on the frame 20 and driven by gears21a and 2311, respectively (see FIG. 1). The cutoff roll 21 illustratedhere is a two-time roll and operates to transversely sever the web W atdiscrete intervals. In addition to providing an anvil surface, the roll23 also has a web-adhering function through the use of internal vacuum.Thus, the leading edge of the web W is caused to follow the surface ofthe roll 23 to the point designated 24 in FIG. 4.

In the configuration of elements given in FIG. 4, the

web W has followed the periphery of roll 23 only part way to the point24. A previous web segment W has been removed from the roll 23 under theinfluence of a folding roll 25. The folding roll 25 has vacuum ports atthe points designated 26, 26a, 26b and operates to remove a middleportion (i.e., half-Way along its length) of a web segment from the roll23. This develops folds F, and F in the segment W. The web Wadvantageously may be longitudinally folded (as by the mechanism D) soas to provide a stack of double folded hankies, napkins, etc.

' The segment W then passes between the surface of the roll 25 and thatof an ironing roll 27 so that a transversely folded web segment isdelivered by orbiting packer fingers 28 to the stack defining station.As can be best seen in FIG. 3, the packer fingers 28 operate to stripsegments from the roll 25 by moving into annular grooves 29thereofbefore the segments W reach that portion of the roll 25. Thisstripping position is seen in dotted line in FIG. 4 and is designated28'.

Web segments (folded or otherwise depending upon the type of deliverymeans) follow a path generally designated 30 and which also is seen inFIGS. 3 and 5. In FIG. 5, a second path is designated 30 and will beappreciated that as many side by side paths can be utilized as isconvenient in an installation. For example, the path 30 would be thatassociated with the righthand set of fingers and grooves 28 and 29 inFIG. 2 while the path 30' with the lefthand set. The stack definingmeans provided herein are essentially the same in each path.

The path 30, as seen in FIG. 4, is arranged at about 45 from thevertica1.-However, for the sake of ease of description, it will bedescribed as being a generally downward path, but those skilled in theart can appreciate that the path may have many other directions thanthat shown and described.

FINGER ASSEMBLIES In the illustration given, we employ four fingerassemblies 31, 32, 33 and 34 to effect the definition of each stack ofweb segments. These asemblies are seen in fragmentary perspective formin FIG. 6 and it will be seen that assemblies 31 and 33 form one set 35while the other assemblies 32 and 34 form a second set 36. Theassemblies 31 and 33 (also designated in FIG. are commonly actuated andare generally aligned in a direction transverse of the length of thepath 30. The same applies to the other set 36 consisting of theassemblies 32 and 34. The assemblies are arranged in pairs on oppositesides of the path 30, assemblies 31 and 32 being on the side 37 whilethe assemblies 33 and 34 are on the side 38. The finger assemblyarrangement also can be readily appreciated from a consideration ofFIGS. 2 and 3.

By providing the finger assemblies as shown, an especially advantageousoperation such as is depicted in FIG. 7 can be achieved. The showing inFIG. 7 is schematic and occurs a short time after the configuration ofelements seen in FIG. 6. In FIG. 6, the packer finger mechanism is seento be moving upwardly after the assemblies 31 and 33 have begun to clampa completed stack against the assemblies 32 and 34. A short time laterthe packer mechanism is delivering a subsequent segment 39 (see FIG. 7)against the upper segment 40 of the just completed stack. By virtue ofthe geometry of these finger assemblies that extend only partiallyinwardly over a minor portion of the stack in the path 30, there isprovided a substantial central portion which is uncompressed oruncompacted and which tends to bulge upwardly. This provides anexcellent frictional engagement surface for the receipt of thesubsequent segment 39 and anchors the same notwithstanding the wipingaction of the packer mechanism 29 in withdrawing for another deposit. Ascan be seen from FIGS. 3-5, the actual fingers of the two sets ofassemblies are offset or interleaved (as at 41 and 42 in FIG. 5) so asto permit the fingers to move more vertically past each other.

As more and more segments are deposited on the aligned finger assemblies31 and 33, we reach the configuration of stacks illustrated in FIG. 8.There, a preceding stack S is seen to be resting on rails 43 (see alsoFIG. 11). Shortly thereafter, the bottom-most stack S will be engaged bythe stack remover generally designated 44 and which includes anupstanding L-shaped clip 45 (see also the central lefthand portion ofFIG. 4). Before this engagement occurs, we prefer to have the lower-moststack S compacted in the fashion seen in FIG. 8. Comparison of FIGS. 7and 8 shows that the stack of say ten hankies confined between the upperset of finger assemblies 31 and 33 and the lower set of fingerassemblies 32 and 34 is compacted in FIG. 7 but is not so compacted inFIG. 8. Rather, in FIG. 8, the lower finger assemblies operate againstthe outlet guide rails 43 to compress the stack S. Thereafter, theelements move into the configuration seen in FIG. 9 where the stack S isnow being removed from the path 30 by means of the clip 45, the lowerset of finger assemblies 32 and 34 having been moved upwardly so as toagain compress the following stack S. Thus, there is a short retrogrademovement of each set of finger assemblies as they approach the bottom ofthe path. Following the retrograde movement indicated in FIG. 9 and theremoval of the stack S, the lower set of finger assemblies 32 and 34move downwardly and then outwardly and upwardly in a generally orbitalmovement such as is designated 46 in FIG. 10, finally re-entering thepath 30 as at 47 after the requisite number of segments has beenintroduced--in the illustration given, ten.

The orbital movement of the finger assemblies can also be appreciatedfrom a consideration of FIG. 13. In FIG. 13, the upper curve representsa projected profile of the cam employed to develop the movement of thefinger assemblies in the direction of the path. As mentioned previously,for the sake of convenience, this can be considered up and down. Thedown movement can be considered in the direction of the path of websegment movement while the up movement can be con sidered against theflow of Web segments. The lower curve in FIG. 13 represents the contourof a second cam which is responsible for the movement of the assembliestransverse to the direction of the path 30. In other words, after thefinger assemblies reach the bottom of that portion of their orbit whichis in the path 30, they must move laterally outwardly from the pathbefore moving upwardly to enter the path in the movement indicatedschematically at 47 in FIG. 10.

An orbit or cycle can be considered to start at the point generallydesignated 48 in FIG. 13 where a given set of finger assemblies is atthe very top of its orbit. From that point there is a movement downwarddesignated 49 and a corresponding inward movement (so labeled) andindicated by the numeral 50 applied to the lower curve. At thisjuncture, the given finger assembly set is ready to receive subsequentweb segments and support the same for the formation of a stack. Theinitial web segment is deposited at a time corresponding to the extremelefthand portion of FIG. 13 and designated 51 relative to the uppercurve and 52 relative to the lower curve.

From a consideration of the upper curve, it will be noted thatthree-quarters of the time of an orbit or cycle is utilized in thedownward movement, the reversal occurring at a point 53 whichcorresponds to 270 of cam rotation. Prior to that time, however, thereis the accelerated downward movement of the finger assemblies of thecharacter depicted in FIG. 8. This is illustrated in FIG. 13 at 54 withthe subsequent return of the finger assemblies to again support thestack S (see FIG. 9) being indicated at 55 in FIG. 13. Thereafter, thefinger assemblies 32 and 34 (as shown in FIG. 10) continue downwardlybut at a point corresponding to about 250 of cam rotation, the fingersare withdrawn from the path as indicated by the lower curve commencingat the point designated 56. Thus, by the time the upward movement iscommenced (see point 53), the finger assemblies are out of the path,being at a point corresponding to that designated 57 in FIG. 13. Atthese points (53 and 57) the stack removal operation has been completed,as by the clip 45 having moved the stack S completely out of the path30. From the portions designated 58 and 59, it will be seen that thereturn or upward movement of the finger assemblies occupies only a minorportion of the cycle.

ORBITING MEANS The means for orbiting the finger assemblies is generallydesignated 60 and includes the mechanism shown essentially in the lowerportion of FIG. 4, particularly the splined shaft 61 at the righthandcentral portion of FIG. 4this being selected as exemplary for ease ofdescription. The splined shaft 61 provides the means for guiding theorbital movement of the finger assembly 31. It will be understood thatin the illustration given, a splined shaft will be provided for each ofthe four finger assemblies 31-34. However, in connection with the shaft31, it will be noted that it is rotatably supported on the frame 20 bymeans of bearings 62 and 63. The splined shaft 61 is inclined at 45 tothe vertical, thus paralleling the direction of the path 30. The fingerassembly 31 is provided as part of an arm 64 (see also FIG. 3) extendingat right angles to the length of the splined shaft 61 and is slideablymounted on the shaft 61 by means of a block 65 (see the central portionof FIG. 5) Still referring to FIG. 5, it is seen that the shaft 61 isprovided with a gear segment 66 which is fixed or pinned thereto. Thisis responsible for the horizontal component of the orbital motion andthe actuating mechanism therefore will be described in detailhereinafter.

Returning now to the means for achieving the vertical component of theorbiting of the finger assemblies, the numeral 67 (seen only in thelower righthand portion of FIG. 4) designates generally a linkage systemfor this vertical component. It includes a cam 68, the contour of whichis seen in projected form in the upper curve in FIG. 13. It will beappreciated that the cam 68 is rotatably mounted on the frame and ispowered by belt 68a (FIG. 1). Usually in machines of this nature, asingle, highpowered motor is used with interconnecting gears, gearreducers, etc. and many of these have been omitted as being conventionalexpedients. Riding against the periphery of the cam 68 is a cam follower69 mounted on an arm 70. The cam follower arm 70 is shownin FIG. 4 onlyas a line, i.e., in schematic form so it is not to obscure withunnecessary detail the remaining portion of the drawing. The camfollower arm 70 is fixed to a transverse pivot or rocker shaft 71mounted in suitable pillow blocks 72 provided as part of the frame 20.Also fixed or pinned to the pivot shaft 71 is a pivot or rocker arm 73(shown schematically in FIG. 4). Pivotedly interconnected between thearm 64 and the end of the rocker arm 73 is a linkage 74 (still referringto FIG. 4). Thus, as the cam follower 69 follows the contour of the cam68, the rocker shaft oscil lates and conveys the same motion to thefinger assembly arm 64. This oscillation includes, for example, theportion of the upper curve in FIG. 13 designated 49 where the fingerassembly is moving downwardly and inwardly to the position designated 47in FIG. 10. The particular portion of the cam contour which serves as anactuator or velocity control for this phase of the operation isdesignated 75. Reference has also been made to the fact that the fingerassembly moves rapidly downwardly to compress a stack about to be takenout of the path 30 (as at S in FIG. 8) and thereafter the fingerassembly moves back into supportive relationship with the succeedingstack S. This is reflected in the upper curve on FIG. 13 at 54 and 55.The corresponding cam contour for this purpose is designated 76 and 77in FIG. 4.

A second cam 78 for the other set 36 of finger assemblies is designated78 in FIG. 4. It will be appreciated that the cam 68 through the camfollower 69 and rocker shaft 71 is responsible for the up and downmovement of both of the finger assemblies 31 and 33 constituting thefirst set 35. A linkage assembly including arms like those designated 73and 74 is provided for the finger assembly 33. The means for moving theother set 36 of finger assemblies 32 and 34 includes a cam follower 79(still referring to the bottom of FIG. 4) cam follower arm 80 and firstrocker shaft 81, suitably journaled in the frame 20. In the illustrationgiven, a second rocker shaft is provided at 82 and is responsive to theoscillation of rocker shaft 81 by virtue of interconnecting gears 83 and84this being provided to reverse the movement of the cam follower 79inasmuch as the same is provided on the opposite side of the cam shaft68b from the cam follower 69, it being appreciated that all of thefinger assemblies follow the same orbit. This output of the rocker shaft82 is transmitted through a rocker arm 85 and linkage 86 to the arm 87(see also FIG. 3) associated with the finger assembly 32. As before, thearm 87 is fixed to a block 88 which is slideably mounted on a splinedshaft 89.

What we have thus far described is the means for moving the fingers 31and 32 up and down. An identical mechanism is used for moving thefingers 33 and 34 up and downthe splined shafts for this latter portionbeing designated 100 and 101 in FIG. 5. These will be described inconnection with means for developing horizontal movement of the fingers.

MEANS FOR ACHIEVING HORIZONTAL COMPONENT OF ORBITAL MOTION To achievethe in and out movement of the finger assemblies, we employ a cam andlinkage system generally designated 90 in FIG. 5. The control for thismovement is provided in the form of a cam 91. A cam follower 92 ispositioned for movement in accordance with the contour of the cam 91 andis rotatably mounted on a cam follower arm 93 (again schematicallyrepresented). The cam follower arm 93 is fixed to a rocker orcross-shaft 94 as is a rocker arm 95. The other end of the rocker arm 95is pivotedly connected to a link 96 which in turn is pivotedly connectedto a block 97. The block 97 has at one end a gear segment 98 and isfixed to the splined shaft 61. Thus, as the rocker shaft 94 oscillatesor rotates, so also does the splined shaft 61. The gear segment 98 isemployed to deliver the same movement to a second gear segment 99mounted on the splined shaft 100. The splined shaft 100 is associatedwith the finger assembly 33 constituting the mate of the finger assembly31 in making up the set 35. Thus, as the finger assembly 31 moves out,so also does the finger assembly 33. Both of these finger assemblies 31and 33 operate from the cam 91. A second cam (not shown) is mountedcoaxially with the cam 91 and is employed for imparting the in and outmovement to the finger assemblies 32 and 34 by virtue of a suitableconnection with the splined shaft 89 and 101. We also provide extensionsfrom these two linkage systems (90 for the set 35 and 102 for the set36) in the form of linkages 103 and 104. These operate to pivotadditional splined shafts as at 61 and 89' associated with a parallelpath 30. Thus, it will be seen that any number of stacking paths can beprovided, depending upon the width limitations of the machine.

OPERATION The machine illustrated in the drawing is intended .fordelivering two streams of stacked paper handkerchiefs. For this purpose,two separate folding devices are provided at the very top portion of theshowing in FIG. 1 as at 105 and 106 for the paths 30 and 30,respectively. As webs (not shown) pass over the folding devices 105 and106, the webs are longitudinally folded for ultimate delivery throughtroughs 107 and 108, respectively at the left center portion of FIG. 1.These troughs or ways are also identified in FIG. 3.

T he webs W are folded transversely in the fashion indicated in FIG. 4in the central portion thereof where the fold portions are designated bythe symbols F and F This is achieved through the cooperation of thefolding roll 25 and the ironing roll 27. The folding roll 25 is equippedwith a gear 25a (see FIG. 1) which, like the other gears pictured,derives rotational power through a series of gears, ultimately, in theillustration given, from a drive pulley 109 on the rear side of themachine and pictured in the upper righthand portion of FIG. 1. Thefolding roll 25 is equipped with the previously referred to vacuumgrooves 29 (see particularly FIG. 3) which are coupled to a vacuum pumpby means of a manifold 110 (see the lower righthand side of FIG. 1), Theframes 20a and 20b are cut out as at 111 (see the central portion ofFIG. 1) for the ready removal of the folding roll 25. This cut out 111provides the basis for the showing of the interior workings in FIG. 2.It will be appreciated that the finger assemblies 31 and 32 alternate inmoving downwardly so as to define stacks. As the finger assembly 32reaches the nadir of its orbit, it is moved laterally outwardly fromengagement with the stack, i.e., out of the paper and then upwardly to aposition above the finger assembly 31. When the fingers 31 and 32 arearranged as illustrated, we offset or interleave them as shown forreadily passing one another.

The fingers 32 in the operation depicted in FIG. 2 are withdrawn fromsupporting relation with a given stack of webs only after the clip 45attached to the stack remover chain 44 has removed a completed stack.

While in the foregoing specification a detailed description of anembodiment of the invention has been set down for the purpose ofillustration, many variations of the details hereingiven may be made bythose skilled in the art without departing from the spirit and scope ofthe invention.

We claim:

1. In delivery apparatus for web segments to be stacked which include aframe (20), a packer mechanism (29) on said frame for delivering saidsegments sequentially into one end of a predetermined path (30), a stackremover (44) on said frame for removing stacks of said segments from theother end of said path in the direction generally perpendicular to saidpath, an improved stack defining mechanism characterized by the factthat it includes:

four finger assemblies (31, 32, 33, and 34) on said frame disposed in apair (31-32 and 33-34) on each of two opposite sides (37, 38) of saidpath, each assembly of a given pair being aligned with one assembly ofthe other pair to provide two sets (35, 36) of finger assemblies, saidfinger assemblies being sized to extend over a minor edge portion of agiven segment (39) in said path so as to present a substantial centralportion of said given segment for frictional engagement with asubsequent segment (40) moving into said path, and means (60) operablyassociated with said finger assemblies sets for sequentially orbitingsaid sets with a portion of each orbit being in said path, and includinga retrograde movement said means being arranged and constructed to limitthe movement of said finger assemblies toward each other so as tonecessarily present said substantial central portion. 2. In deliveryapparatus for web segments to be stacked which includes a frame (20), apacker mechanism (29) on said frame for delivering said segmentssequentially into one end of a predetermined path (30), a stack remover(44) on said frame for removing stacks of said segments from the otherend of said path in the direction generally perpendicular to said path,an improved stack defining mechanism characterized by the fact that itincludes:

four finger assemblies (31, 32, 33 and 34) on said frame disposed in apair (3132 and 33-34) on each of two opposite sides (37, 38) of saidpath, each assembly of a given pair being aligned with one assembly ofthe other pair to provide two sets (35, 36) of finger assemblies, saidfinger assemblies being sized to extend over a minor edge portion of agiven segment (39) in said path so as to present a substantial centralportion of said given segment for frictional engagement with asubsequent segment (40) moving into said path, and means (60) operablyassociated with said finger assemblies sets for sequentially orbitingsaid sets with a portion of each orbit being in said path, said meansincluding an actuator to position a set commencing said orbit portion incompacting relation with a stack supported on the other set whereby saidcentral portion is caused to upstand relative to said commencing setfinger assemblies during at least the initial build up of a succeedingstack.

3. The apparatus of claim 2 in which said means includes a secondactuator (76) for accelerating the movement of each set shortly prior tothe end of its movement in said orbit portion to compact a precedingstack just prior to engagement of said preceding stack with said stackremover.

4. The apparatus of claim 3 in which said means includes a thirdactuator (77) for reversing the movement of each set for a predeterminedtime immediately following the compaction of said preceding stackwhereby the stack following said preceding stack is supported free ofengagement of said stack remover, said stack remover being arranged andconstructed to engage said preceding stack only after the beginning ofthe reverse movement.

5. The apparatus of claim 1 in which each finger assembly includes aplurality of finger parts projecting into said path, the finger parts ofone assembly of a given pair being offset (41, 42) from the finger partsof the other assembly of said given pair whereby said parts are adaptedto pass each other during sequential orbiting thereof.

6. The structure of claim 1 in which said means includes four splinedshafts (61, 89, 100, 101) rotatably mounted on said frame,finger-assembly carrying arms (64, 87) movably mounted on said shafts(61, 89) means interconnecting pairs of said shafts for cooperativeaction in rotating the same, and gear means coupled to said arms andcooperative rotating means for orbiting said finger assemblies.

References Cited UNITED STATES PATENTS 3,254,889 6/1966 Nystrand 27l69RICHARD E. AEGERTER, Primary Examiner US. Cl. X.R.

